DESCRIPTION

The backupvolrestore command restores the contents of one or more
volumes to the site indicated by the -server and -partition arguments.
Use the command either to overwrite the contents of existing volumes
with the restored data or to create new volumes while retaining the
existing ones. The specified site does not have to be the current site
for the volumes.
(If the "FILE YES" instruction appears in the
/var/lib/openafs/backup/CFG_device_name file associated with the
specified port offset, then the backupvolrestore command restores data
from the backup data file listed for that port offset in the Tape
Coordinator’s /var/lib/openafs/backup/tapeconfig file, rather than from
tape. For the sake of clarity, the following text refers to tapes only,
but the Backup System handles backup data files in much the same way.)
The command’s arguments can be combined as indicated:
· To preserve a volume’s current contents and also create a new
volume to house the restored version, use the -extension argument.
The Backup System creates the new volume on the server and
partition named by the -server and -partition arguments, assigns it
the same name as the current volume with the addition of the
specified extension, and creates a new Volume Location Database
(VLDB) entry for it. Creating a new volume enables the
administrator to compare the two versions.
· To overwrite a volume’s existing contents with the restored
version, omit the -extension argument, and specify the site as
indicated:
· To retain the current site, specify it with the -server and
-partition arguments.
· To move the volume to a different site while overwriting it,
specify the new site with the -server argument, -partition
argument, or both. The Backup System creates a new volume at
that site, removes the existing volume, and updates the site
information in the volume’s VLDB entry. The backup version of
the volume is not removed automatically from the original site,
if it exists. Use the vosremove command to remove it and the
vosbackup command to create a backup version at the new site.
· To restore a volume that no longer exists in the file system,
specify its name with the -volume argument and use the -server and
-partition arguments to place it at the desired site. The Backup
System creates a new volume and new VLDB entry.
In each case, the command sets each volume’s creation date to the date
and time at which it restores it. The creation date appears in the
"Creation" field in the output from the vosexamine and voslistvol
commands.
If restoring all of the volumes that resided on a single partition, it
is usually more efficient to use the backupdiskrestore command. If
restoring multiple volumes to many different sites, it can be more
efficient to use the backupvolsetrestore command.
By default, the backup volrestore command restores the most recent full
dump and all subsequent incremental dumps for each volume, bringing the
restored volumes to the most current possible state. To restore the
volumes to their state at some time in the past, use the -date
argument. The Backup System restores the most recent full dump and each
subsequent incremental dump for which the clonedate of the volume
included in the dump is before the indicated date and time (the clone
date timestamp appears in the "clone date" field of the output from the
backupvolinfo command). For backup and read-only volumes, the clone
date represents the time at which the volume was copied from its
read/write source; for read/write volumes, it represents the time at
which the volume was locked for inclusion in the dump. The resemblance
of a restored volume to its actual state at the indicated time depends
on the amount of time that elapsed between the volume’s clone date in
the last eligible dump and the specified time.
If the -volume argument specifies the base (read/write) form of the
volume name, the Backup System searches the Backup Database for the
newest dump set that includes a dump of either the read/write or the
backup version of the volume. It restores the dumps of that version of
the volume, starting with the most recent full dump. If, in contrast,
the volume name explicitly includes the ".backup" or ".readonly"
extension, the Backup System restores dumps of the corresponding volume
version only.
To generate a list of the tapes the Backup System needs to perform the
restore operation, without actually performing it, combine the -n flag
with the options to be used on the actual command.
If all of the full and incremental dumps of all relevant volumes were
not written to a type of tape that a single Tape Coordinator can read,
use the -portoffset argument to list multiple port offset numbers in
the order in which the tapes are needed (first list the port offset for
the full dump, second the port offset for the level 1 incremental dump,
and so on). If restoring multiple volumes, the same ordered list of
port offsets must apply to all of them. If not, either issue this
command separately for each volume, or use the vosvolsetrestore
command after defining groups of volumes that were dumped to compatible
tape types. For further discussion, see the IBMAFSAdministrationGuide.
The Tape Coordinator’s default response to this command is to access
the first tape it needs by invoking the MOUNT instruction in the local
/var/lib/openafs/backup/CFG_device_name file, or by prompting the
backup operator to insert the tape if there is no "MOUNT" instruction.
However, if the "AUTOQUERY NO" instruction appears in the
CFG_device_name file, or if the issuer of the butc command included the
-noautoquery flag, the Tape Coordinator instead expects the tape to be
in the device already. If it is not, or is the wrong tape, the Tape
Coordinator invokes the "MOUNT" instruction or prompts the operator. It
also invokes the "MOUNT" instruction or prompts for any additional
tapes needed to complete the restore operation; the backup operator
must arrange to provide them.

OPTIONS

-server <destinationmachine>
Names the file server machine on which to restore each volume. If
this argument and the -partition argument indicate a site other
than the current site for each volume, and the -extension argument
is not also provided, the Backup System removes the existing
volumes from their current sites, places the restored contents at
the specified site, and changes the site information in the
volume’s VLDB entry.
-partition <destinationpartition>
Names the partition to which to restore each volume. If this
argument and the -server argument indicate a site other than the
current site for each volume, and the -extension argument is not
also provided, the Backup System removes the existing volumes from
their current sites, places the restored contents at the specified
site, and changes the site information in the volume’s VLDB entry.
-volume <volumetorestore>+
Names one or more volumes to restore, using the volume name as
listed in the Backup Database. Provide the base (read/write) name
of each volume to have the Backup System search the Backup Database
for the newest dump set that includes a dump of either the
read/write or the backup version of the volume; it restores the
dumps of that version of the volume, starting with the most recent
full dump. If, in contrast, a volume name explicitly includes the
".backup" or ".readonly" extension, the Backup System restores
dumps of the corresponding volume version only.
-extension <newvolumenameextension>
Creates a new volume to house the restored data, with a name
derived by appending the specified string to each volume named by
the -volume argument. The Backup System creates a new VLDB entry
for the volume. Any string other than ".readonly" or ".backup" is
acceptable, but the combination of the existing volume name and
extension cannot exceed 22 characters in length. To use a period to
separate the extension from the name, specify it as the first
character of the string (as in ".rst", for example).
-date <datefromwhichtorestore>+
Specifies a date and optionally time; the restored volume includes
data from dumps performed before the date only. Provide a value in
the format mm/dd/yyyy [hh:MM], where the required mm/dd/yyyy
portion indicates the month (mm), day (dd), and year (yyyy), and
the optional hh:MM portion indicates the hour and minutes in
24-hour format (for example, the value "14:36" represents 2:36
p.m.). If omitted, the time defaults to 59 seconds after midnight
(00:00:59 hours).
Valid values for the year range from 1970 to 2037; higher values
are not valid because the latest possible date in the standard UNIX
representation is in February 2038. The command interpreter
automatically reduces any later date to the maximum value.
If this argument is omitted, the Backup System restores all
possible dumps including the most recently created.
-portoffset <TCportoffest>+
Specifies one or more port offset numbers (up to a maximum of 128),
each corresponding to a Tape Coordinator to use in the operation.
If there is more than one value, the Backup System uses the first
one when restoring the full dump of each volume, the second one
when restoring the level 1 incremental dump of each volume, and so
on. It uses the final value in the list when restoring dumps at the
corresponding depth in the dump hierarchy and all dumps at lower
levels.
Provide this argument unless the default value of 0 (zero) is
appropriate for all dumps. If 0 is just one of the values in the
list, provide it explicitly in the appropriate order.
-n Displays the list of tapes that contain the dumps required by the
restore operation, without actually performing the operation.
-localauth
Constructs a server ticket using a key from the local
/etc/openafs/server/KeyFile file. The backup command interpreter
presents it to the Backup Server, Volume Server and VL Server
during mutual authentication. Do not combine this flag with the
-cell argument. For more details, see backup(8).
-cell <cellname>
Names the cell in which to run the command. Do not combine this
argument with the -localauth flag. For more details, see backup(8).
-help
Prints the online help for this command. All other valid options
are ignored.

OUTPUT

If the issuer includes the -n flag with the command, the following
string appears at the head of the list of the tapes necessary to
complete the restore operation.
Tapes needed:

EXAMPLES

The following command restores the volume user.pat to partition /vicepa
on machine "fs5.abc.com":
% backup volrestore -server fs5.abc.com -partition a -volume user.pat
The following command restores the volumes "user.smith" and
"user.terry" to partition /vicepb on machine "fs4.abc.com", adding a
".rst" extension to each volume name and preserving the existing
"user.smith" and "user.terry" volumes. Only dumps created before 5:00
p.m. on 31 January 1998 are restored. (The command is shown here on
multiple lines only for legibility reasons.)
% backup volrestore -server fs4.abc.com -partition b \
-volume user.smith user.terry \
-extension .rst -date 1/31/1998 17:00
The following command restores the volume user.pat to partition /vicepb
on machine "fs4.abc.com". The Tape Coordinator with port offset 1
handles the tape containing the full dump; the Tape Coordinator with
port offset 0 handles all tapes containing incremental dumps. (The
command is shown here on two lines only for legibility reasons.)
% backup volrestore -server fs5.abc.com -partition a \
-volume user.pat -portoffset 1 0

PRIVILEGEREQUIRED

The issuer must be listed in the /etc/openafs/server/UserList file on
every machine where the Backup Server or Volume Location (VL) Server is
running, and on every file server machine that houses an affected
volume. If the -localauth flag is included, the issuer must instead be
logged on to a server machine as the local superuser "root".

SEE ALSO

COPYRIGHT

IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0.
It was converted from HTML to POD by software written by Chas Williams
and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.